[GUSU]

Hello to everybody;

I have done a simulation in CFX 11 but the results seems to be not realistic.
I´ve done the tutorials and I have read the post of the forum but I cant solve the simulation. So I ask you for help and recomendations.

I am trying to study the velocity profile in a Pump Station(PS) in order to demostrate that the velocities at any point of the Pump Station is not too high. The porpuse it isnt study the velocity at the inlet of the Pump Suction Bell, but to study the velocity profile in the chamber of the Pump Station(PS).

I have attached an image of the PS (this is the model with the walls. In the CFX I have modeled the "negative"..just the water).

The Inlet will be always submerged
The Outlet are the five cilinders (Pump Suction Pipes)and also will be always submerged. The Pump Suction Pipe are 800 mm separated from the bottom.

The BC I have set are:

Inlet

Location = Pipe Inlet
Definition =Subsonic/Normal Speed = 1.5 m/s / Turbulence Medium Intensity

Outlets =

Location = Bottom face of each cylinder
Definition =
Subsonic/Normal Speed = 9 m/s (The velocity of the Outlet has been set in order to satisface Vin*Area in = Vout*Area out)

Opening =

Location=Top of the PS.
Definition=Atmospheric Relative Pressure = 1 atm (Reference Pressure = 0 atm)

Walls =

Location= All the peripherial faces incluiding the lateral faces of the cylinders.
Definition= Smooth/No slip

Questions:

1-Which domain definition is the most suitable for this problem? Multiphase or Single Phase?.
2-How Should I define the Outlets? I guess that are not correctly defined.
3-In case the inlet wasnt submerged and I want to model the free surface, Which BC of multiphase domain do I have to set (using the expression of tutorial 7)?

Thanks